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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2d0f37491a3596f925eb379f1d162f8f1315a8c2c446d058b36ce1de5adb455' 
  AND token = 'dBQpNg39sSRiJZytdP7kgZ/bG9bgQ7/ET5SaETIVr1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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