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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a122e28119df7bada728f06fe0d2b1a561f078fc73ca5c34aa26522a9a82ea89' 
  AND token = 'nQpu48RN2lLkVZPl2sk3LxYmMS+Qd9w++wRBKMzlZ7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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