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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a83077ef5a72b54e9b5846c211f7759d2ee8258d7c719fe058f5f5b3c02d6eb4' 
  AND token = 'S/lyBe0Ax5gikCmWcwmTjkod9OUztnnOb1Mk53XI/yw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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