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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a3c9d8c0b9f6313c7e693de50223a1b6ab73a4af777981cdf249e2647d3ba62' 
  AND token = 'RSM3twYbefi8Wj22Gmb4kMuC/0LVJJdF1doSAqN5CHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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