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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f203f09631de2aa732aa909dffe9f31967c09c59fd575eb5c9b32364c44ee5a' 
  AND token = 'VieUSUXQkfN2g5SNjBkSofEwpVv2qXZ2BPR3xv/XyrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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