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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf5d68f1eb7b0083527ee0dc510f503508ce4ad88e73951cd080554a1f956616' 
  AND token = '6743pJpDH76UEvnV3sxuOK70nxbRGO+5Br4XD8DRSZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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