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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab76ef9b0dd55c6397830bb84b298e1e8cd34936ba489704e24d4c1d65f1cd14' 
  AND token = 'QlkSJc2Z1sX6yIka3yWQacUVX5XCKWuhLeHToFQ1Fyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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