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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7926fb9ea2144eb89d6019a8b2842a0c3702f66ab03f289c1bcaff99e0198067' 
  AND token = '05ZdlRtALt8P99aGU+izQKMxT4nfS33yK88vMHNTFyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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