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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0acd007229f89df34ab7629492feab34b0ff9ca9b73121acc33975ff36003733' 
  AND token = 'rE6NJRBlUNIZKer+B7nZ+ZmecybKphN/qtk2LHaYTds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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