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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5526b3be411a2adf7199dbd16a5a4941c5ff6b63a69d06814f7a798d704ee2b' 
  AND token = 'dI2/TDs4urLVppm6woJ2TsDMx0CVzSIVMYMZAqb/VO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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