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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32a918af0844959292c00a2ac2e1c7062df5446b4fb4ffa2c9fbb6cf4fbb3e05' 
  AND token = 'Ws5mVpdyRTcwH5Q0PNScB/7v8pJYWzFAVPT2ZQ+PSCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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