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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '623a6fcad94dffc63e4caf483a9edd63135086abf2e425856d17dd6f709b0c58' 
  AND token = '3zUxpOHLNn1LloGz/ougC+CIq+Otk5f/WHmCmNss4Xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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