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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c7128dcf7b7fb2c7c9c807d42c6b4ef1eff57564435bd2904fd4d78e15fa63e' 
  AND token = 'Ke8ZSIXy1T85FCVltwoJwcd5sctGfO2URKcL+63z5bM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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