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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1a7b40199414614d957fbbf9162dffbe78f3785ee8336c6cbd417d316f6d32d' 
  AND token = 'zHDqMOeTyc+sPWhJ3Gb02hRnNu/eNminBH2+GrQATi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}