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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee34eb3fd4b797c5035946223a34fac6b74df1e4043132450f1facdacfd90b44' 
  AND token = 'KdzrW7jcvY2l+OGdtqwM6iArTp/RL6L4ystfqYg5XTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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