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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac63c3f5323495220b3bda936d661c2f455f74055bf00a4a0b0b1990be9eb6ea' 
  AND token = 'n1lFJYBS9JO38T71yDAsc0Nw09rZheztv7R7W3oyvtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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