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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01394d0bdec87cef3218542e9481622dc4857e8a7e84d6d416921f9fcb1804c7' 
  AND token = 'jcWK/v8B+tr+clCt50cVvAAJX020dWor4ujEhaulVjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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