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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7560de99b551f8df06c7bd91a61682869a5e328ea64b99be344102595caf79aa' 
  AND token = 'z1r67QkZB+T6jbvaLfMansb9mPgGhwwN5p+r9pzEyBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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