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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a17c36819da6b43a62e6de134b5f209082a74877f08ab9ba315846d0371a7c8' 
  AND token = 'fjINipWur7FlOPROvbnhOvWI+3EaoMqscOyY/zQZRA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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