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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8c63cdb5b6bfbb45cfe32d0a0a9e1cdd5bed188f1bb411935f2cba17682c01d' 
  AND token = '0/cxQ1OE4pT0k099PxUHQvocHNwbfxk0HFJtCIJUxtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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