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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf05aec74fc6274dd14a21c889b6c9c00eb8f49345c1a6c76047fc282d642eb8' 
  AND token = 'Bcw6IdERnOa1N4Z/T7UnpaPAtj+JKo7URiu5JPxqyFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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