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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44a529dc244bb5813db9a0ce3ebbe37d44445cad5c6c8ca9115969fd5b8d93b4' 
  AND token = 'eAAJbL2692JPdIQtiwANKNgZlpUlEEQEPmcfsr6HnSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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