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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f81b23f4dbcfec4f5be245b1969405fd28a0a863168dc4584ed75dd15174a928' 
  AND token = '5x10rxAwieLUvVRLF1lDUHFq6f/CiZFTaI3vCPIc9xU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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