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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c71b7c90755d4367914964ec917d7aec0dbe149331ec989446520b5aaca7d3d' 
  AND token = 'vee0yRXT++pMmdwahX/1Vl813LUa+Lyg1J6teCO9B3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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