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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7abacc6323a76c774a186b93f7b94c58d277e6924cd4a4e9432f23f9e008a220' 
  AND token = 'Htu1LQifJ/1Xfs9Qh66cnjIavPNnLRBQ/3NZz0wsZjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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