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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75fe90aa7fd6abbb938b8f1e8e3aca80649cc973a9825f973f4f307f06b7b401' 
  AND token = 'f+cni3B/21o7SxehEDi9ad5jB0JKTYcRnmsAOC5/n0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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