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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '042e58863f6703a5665ff1d9fb4d82488c279119dc2f2780db108224f458a125' 
  AND token = 'EsaT9Ub70dFHsU7PEo7JjM33bW3Sbi+J06zwWvYh6vw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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