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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d4a1d1327ffb1721a07156f14381612452f824aba3db77f9791eb97f45d8a35' 
  AND token = 'ueiv2XDdddANVaGGnCa8iNUvVgZ9oCF3ebH+GgmQoxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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