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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b67801e26b4b4dee3a572418117a346b62ee43d3ed2fa40d616819a1544fc75a' 
  AND token = 'JqmkADdVSOuc8y44aD2eFetrF3GBhZPOhbhbPYJ290k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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