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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d09f30caecfb58b3c9001b45a060b3306ddef0ae7d3935ec7ddf3d7fe0ce2f1' 
  AND token = 'NmYEyclpOm1gRjpyP17WDiIuZ80OzG5JgJzo1FclXOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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