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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '798653cbfe5080e380507d92b89591c95abc219906e1f464829ab21401aa31fd' 
  AND token = '5HaE3lbwhBi9ZNpPt37RkwDB6BpdOP+d5mDPF+pn/uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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