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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07029b90b2b1c761041ca0a596d295f841b6b690a51efe627269839e4d8a0b06' 
  AND token = 'HqZeGhNF0csppJrWYf0NvcHg+a+kzJqRQ3HWks933f4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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