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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb7311aa6d7f5728c6dab583913b594997de93d67b87daa47045c832f18358f9' 
  AND token = 'PENtFyd11cw2UyxyiYMN2c5GjWTUeNu3tSTQ2+Ei3+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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