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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f97aae0db9240c7e02e2b0b4506a966917e3b3154f5816b9b0be4139075a184c' 
  AND token = '9LRySbJFFvl8jW8Vu9nDA+U0lfS99QpGndLqZS0uU3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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