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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c2d597cd849ee986ffb4773bb8ac0482feb46d7c6760a51432dc6b80788343c' 
  AND token = 'eL8O82xU0qvrhBqYYv5rCfOqIbZN90PwzWJbcNm5mTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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