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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53d3f03c655817f938cb3c3c4925095fac0b44cf5212df7f61a05acf2ea026d5' 
  AND token = 'TpCYcNWMearEwr2bBQJMJtd/rFmQ2iIUVoF61/6gncw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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