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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9df852cbf2ddaa2f940d00e24054f48c8b9033df02654107dcac79398dd169a9' 
  AND token = 'NU03tv+vyDucGk6ymlQvJLX7K0R9CBGJzb/b10OeiT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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