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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '977b4b49c6c36bb2f753fc2ec516c093eb7af3ceda055493219c02ef363faa0d' 
  AND token = 'GcUUxoAASGF/T/BRq13QB4AH231kBGSZ9Sk/giVZVqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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