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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adcc6d5a40188d88e493d3fa9510ceb74d945f4a5acb21c3f989be779dd21da2' 
  AND token = 'x7SSqy3zXCA/HiXxT1zoqcHTzrlcenOXI8Uc3pPdEVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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