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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74eb760bdb3fce7ffaf53545ba58c5e5d6a6086339f363c7c9d92fc708580435' 
  AND token = 'gdSKQWU2AIfrLswTspLoK60jLoU+BGBRFE8E0TTBAe8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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