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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f120cde7c656723600cb4ddbc8b1ba20b59a301e47cff83ed89f87e04efa618e' 
  AND token = 'ISAGTO9E4KdULselI/g0UssU2tPq9DN8z0DFqTnxuCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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