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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd58b1527e2a1bcd917a54da60568f6e2fe7c2a04e648cf1bdb886db9ff968a70' 
  AND token = '0ZOiw1QocUw81rA1yF1wwxAGUrJ+GnrHFjrdjcQ6ZQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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