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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7c26ecd296e5aea03a7df82ee0e4b0d25d9dd595a3ccb61aac82b8c5ce5c0c1' 
  AND token = '0U1Sdg1LCpLB/Ihh5FXZzvt9BQkO5zxw+06g+cneYg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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