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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aeec4bb0f4dbc9319d3e2124d45ae3d5fa5ec0972af16b1263ecb0e8223ec52' 
  AND token = 'muBnewQpq3FLa/VcX5AR8vX52LIkdPfxt7pounwmjK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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