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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85554a5036bdb5e5a5c078676ba4365734350fe6a0e4a917e8f6f4cea6a9d822' 
  AND token = 'DK5vJ+0ZofshEvIQ/A1Bcy0i6/phZZAnNYeEI4Vpnh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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