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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '155388a4f282075fd5aa969afaf404c2a9b4391f2f226b596cb42efe4d4c46d9' 
  AND token = '0w/qY95ZJA7XKlYZgcIwfll+Rp3lP6Zu3Xeyig1Cal0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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