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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '003fb36df669b1d81ebb32907baa2b4d6a3137797c686d7df75dda20aa2cd0fd' 
  AND token = 'JFFWjMKoJ1YErsAk6VpVKYYitKHQkOC2RIiDqdUGu0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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