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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2823f723413c37a2c2c3f9cc5dc7c4e2a0015d494b044d18444d8aff2880a4a' 
  AND token = '5KKxolfaGNbLLqCO57u2hvIYIL9q6mdWADUcWw1ntYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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