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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bec7f6d1053232fc33b7d34f443fc69fdee6b259cd4fe30bfbf79dfdcd6a3af7' 
  AND token = '5zReUjpx2qg6X32sFX3XNFAEH3K26ykfTBRQih7jViw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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