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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88d78b974fdbc97e6b422da66eba198edd5ae4681d5df4fd606b5d8769d5e24b' 
  AND token = 'MATFMegI6n9ZNjKyIWHPgC5q2Ppp7oSXIURQtGglD6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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