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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dec2f7ac028772aaa53d1e3455599cdce2cf032d055d6f8ee82a953415ef2bfc' 
  AND token = 'xusvncxzzlEWFzLF6ZJo78iRScR33a2fLA/P1FzDH8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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